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<h1><a name="SECTION0032200000000000000000">
30.2 <tt class="module">symbol</tt> --
         Constants used with Python parse trees</a>
</h1>

<p>
<a name="module-symbol"></a>

<p>
This module provides constants which represent the numeric values of
internal nodes of the parse tree.  Unlike most Python constants, these
use lower-case names.  Refer to the file <span class="file">Grammar/Grammar</span> in the
Python distribution for the definitions of the names in the context of
the language grammar.  The specific numeric values which the names map
to may change between Python versions.

<p>
This module also provides one additional data object:

<p>
<dl><dt><b><tt id='l2h-5429' xml:id='l2h-5429'>sym_name</tt></b></dt>
<dd>
  Dictionary mapping the numeric values of the constants defined in
  this module back to name strings, allowing more human-readable
  representation of parse trees to be generated.
</dd></dl>

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  <dl compact="compact" class="seemodule">
    <dt>Module <b><tt class="module"><a href="module-parser.html">parser</a></tt>:</b>
    <dd>The second example for the <tt class="module"><a href="module-parser.html">parser</a></tt>
                     module shows how to use the <tt class="module">symbol</tt>
                     module.
  </dl>
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<span class="release-info">Release 2.5.1, documentation updated on 18th April, 2007.</span>
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